Device for expanding finger-rings.



No. 682,209. Patented Sept. 10, I901.

A. LEMMERT.

DEVICE FUR EXPANDING FINGER RINGS.

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(Applicationfle F 2, 9

(No Model.)

UNITED STATES FFlCFt PATENT DEVICE FOR EXPANDING FINGER RINGS.

SPECIFICATION forming part of Letters Patent 0. 682,209, dated September10, 1901. Application filed February 20, 1901. Serial No. 48.095- (Nomodel.)

To all whom it may concern:

Be it known that I, AUGUST LEMMERT, a citizen of the United States,residing at Baltimore, in the State of Maryland, have invented certainnew and useful Improvements in Devices for Expanding Finger-Rings, ofwhich the following is a specification;

I have produced a device for expanding finger-rings, and the improvementtherein will be set out in the claims appended hereto and illustrated inthe accompanying drawings, in which- Figure 1 shows in front view agrooved pressure-roller device as it is mounted for engagement with andpressure upon a ring on a tapering mandrel in the operation of a rollingpressure to expand the ring. Fig. 2 is a vertical section of the same,the fixed tapering mandrel and the grooved pressureroller being inelevation and the ring upon the fixed mandrel in engagement with thegroove of the pressure-roller. Fig. 3 is a vertical section transverselyof the fixed tapering mandrel and of the grooved pressureroller, showingthe engagement of the latter with the ring on the mandrel. Fig. 4 is aside view of the same. Fig. 5 is a horizontal section showing the fixedtapering mandrel and the correspondingly-formed rolls whereby thepressure-roller device is supported in the operation of rotating it inengagement with the ring.

The mandrel 1 is the fixed element of the device, standing, preferably,in a horizontal position from a bench-vise or otherwise fixed and,tapering from its fixed connection, forms a holder and the support forthe ring in the operation of expanding it. The expanding element is agrooved pressure-roller device adapted to be clamped upon the fixedtapering mandrel, with its grooved roller in engagement with the ring,and to be rotated so that the pressure-roller will operate to expand thering. This pressure-roller device comprises a stock 2, its upper endterminating in a screw-socket 3 and its lower end formed somewhat like atray standing out so that its center is in line with the axis of thescrewsocket, while between these parts the stock is recessed to givefree way for the engagement of the pressure-roller, with the ring on themandrel. The tray stands out from each side of the stock and has mountedwithin each end a pair of rolls 4:, which form bearings for the taperingmandrel, and for this. purpose each pair of rolls has a tapering form toconform to the taper of the fixed mandrel. Intermediately of thesetapering rolls and the screw socket a swing-arm 5 is pivotally mountedupon the stock and carries a pressure-roller 6, so that it overhangs thetray, preferably centrally with the axis of the mandrel and centrallybetween the inner ends of the pairs of tapering rolls, as in Figs. 3 and5. A feature of this pressure-roller is that it has a taper form toconform to the taper of the mandrel and has a plurality of circulargrooves 7 of different sizes to suit different sizes of rings to beexpanded and as a means whereby the pressure-roller is engaged with thering on the mandrel. The pressure-roller is removable and may bereplaced by rollers suited for different rings. The pairs of trayrollsare placed to give a firm bearing of the device upon the mandrel, whilethe pressureroller is adapted to engage the ring on the mandrel betweenthe inner ends of the pairs of rolls, so that the pressure upon the ringwill be central with the axis of the mandrel.

In Figs. 1 and 2 is seen the pressure-roller device clamped by ascrew-stem in the screwsocket upon the ring on the tapering mandrel,with the grooved pressure-roller in engagement with the ring 9, so thatthe roller having been thus set under pressure, with its groove engagingthe ring, the operator grasping the screw-socket rotates the device uponand around the ring on the tapering mandrel, and thereby the ring iscaused to be expanded as the pressure thereon enlarges its diameter.

In expanding rings having projections or set with ornaments the settingis placed free from injury in the middle tray-space, and the device isthen vibrated upon the mandrel, so that the grooved pressure-roll cannotcome in contact with the ring-setting. The opposite end walls 10 of thetray are fastened by screws to facilitate the mounting of the trayrolls.Obviously a sliding carrier for the grooved pressure-roller may besubstituted for the swing-arm. The rotation or vibration of thepressure-roller device upon the ring loosens it upon the mandrel. Thepressure of the grooved roller is then released and the ring pushed uptight on the mandrel. The pressure-roller device is then moved to againplace its grooved roller in engagement with the ring and again clampedupon the ring. The rotation or vibration of the device around the ringis then repeated to again loosen the rin In this Way the ring isexpanded by pressure and set up on the mandrel until it has the desiredsize.

I claim 1. In a device for expanding finger-rings and in combinationwith a fixed tapering mandrel,a pressure-roller device comprising astock having bearing-rolls in pairs, and a carrier having a groovedroller adapted to engage a ring on the mandrel and means wherebypressure upon the grooved roller effects and maintains its engagementwith the ring, the said bearing rolls and the said groovedpressure-roller tapering to conform to the taper of the mandrel.

2. A pressure-roller device for expanding finger-rings consisting of astock having tapering bearing-rolls in pairs, a suitable carrier havinga grooved tapering roller, and means whereby the said grooved-rollercarrier is put under pressure to permit the groove-roller to be operatedin engagement with a ring suitably supported to be expanded under arolling pressure.

3. A pressure-roller device for expanding rings consisting of a stockhaving tapering bearing-rolls in pairs, a tapering roller having aplurality of circular grooves of different widths, a carrier for saidgrooved roller and means whereby it is put under pressure to allow thegrooved roller to be operated in engagement with a ring on a fixedmandrel whereby the ring is expanded by a rolling pressure.

In testimony whereof I affix my signature in presence of two witnesses.

AUGUST LEMMERT.

WVitnesses:

FRANK BENNETT, SAMUEL BENNETT.

